Implement ETH P2P (#81)

* refactor: move things to types

* feat(ethwire): bring in message type from ethp2p

30c11138d5/src/message.rs

* feat(ethwire): add eth-stream with Stream/Sink impls

* feat(ethwire): make Sink error an EthStreamError

* feat(ecies): expose util module

* add more deps

* feat: add broadcast newblockhashes

* fix: rlp serialize with message-id first

* chore: cleanup doc

* wip: test eth connection

* bump cargo lock

* feat: add rlp codec and get stream tests working

* fix: convert RlpCodec to PassthroughCodec

we were rlp encoding twice

* Revert "fix: convert RlpCodec to PassthroughCodec"

This reverts commit 6e6e0a58112c14d7ffba62dc83f9747ddc280641.

This does not handle framing, which would fail decoding if a partial
write happened to the socket.

* add tracing

* refactor: add handshake error

* feat(ethwire): add status handshake

* test(ethwire): handshake works

* refactor: expose EthStream::new

* chore: clippy lints

* fix: get rid of rlp codec

we can instead use LengthLimitedCodec from Tokio IO, which we re-export
as PassthroughCodec

* fix(eth): add handshake + msg error checks

1. 10MB message lengths
2. Same Genesis, Version, Chain on Status Handshake

* chore: ignore result_large_err

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/common/rlp/src/encode.rs

@@ -10,6 +10,7 @@ fn zeroless_view(v: &impl AsRef<[u8]>) -> &[u8] {
 }
 
 impl Header {
+    /// Encodes the header into the `out` buffer.
     pub fn encode(&self, out: &mut dyn BufMut) {
         if self.payload_length < 56 {
             let code = if self.list { EMPTY_LIST_CODE } else { EMPTY_STRING_CODE };
@@ -22,6 +23,13 @@ impl Header {
             out.put_slice(len_be);
         }
     }
+
+    /// Returns the length of the encoded header
+    pub fn length(&self) -> usize {
+        let mut out = BytesMut::new();
+        self.encode(&mut out);
+        out.len()
+    }
 }
 
 pub const fn length_of_length(payload_length: usize) -> usize {

crates/common/rlp/src/types.rs

@@ -1,4 +1,4 @@
-#[derive(Clone, Default, PartialEq)]
+#[derive(Debug, Clone, Default, PartialEq, Eq)]
 pub struct Header {
     pub list: bool,
     pub payload_length: usize,